fix: reset stale shadow map texture and use ShaderResource-only depth fallback to avoid Vulkan layout mismatch

Author: xen2

sources/engine/Stride.Graphics/GraphicsDeviceExtensions.cs

@@ -166,7 +166,7 @@ public static Texture GetSharedDepthTexture(this GraphicsDevice device)
                 ? new Texture(device, "DepthTexture")
                 : new Texture(device);
 
-            var description = TextureDescription.New2D(1, 1, PixelFormat.D32_Float, TextureFlags.DepthStencil | TextureFlags.ShaderResource);
+            var description = TextureDescription.New2D(1, 1, PixelFormat.D32_Float, TextureFlags.ShaderResource);
             texture.InitializeFrom(description);
 
             return texture;

sources/engine/Stride.Rendering/Rendering/Shadows/LightDirectionalShadowMapRenderer.cs

@@ -542,6 +542,7 @@ public override void UpdateLightCount(int lightLastCount, int lightCurrentCount)
 
             public override void ApplyViewParameters(RenderDrawContext context, ParameterCollection parameters, FastListStruct<LightDynamicEntry> currentLights)
             {
+                shadowMapTexture = null;
                 for (int lightIndex = 0; lightIndex < currentLights.Count; ++lightIndex)
                 {
                     var lightEntry = currentLights[lightIndex];
@@ -576,7 +577,7 @@ public override void ApplyViewParameters(RenderDrawContext context, ParameterCol
                     }
                 }
 
-                parameters.Set(shadowMapTextureKey, shadowMapTexture);
+                parameters.Set(shadowMapTextureKey, shadowMapTexture ?? context.GraphicsDevice.GetSharedDepthTexture());
                 parameters.Set(shadowMapTextureSizeKey, shadowMapTextureSize);
                 parameters.Set(shadowMapTextureTexelSizeKey, shadowMapTextureTexelSize);
                 parameters.Set(cascadeSplitsKey, cascadeSplits);

sources/engine/Stride.Rendering/Rendering/Shadows/LightPointShadowMapRendererCubeMap.cs

@@ -247,6 +247,7 @@ public override void ApplyDrawParameters(RenderDrawContext context, ParameterCol
                 var boundingBox2 = (BoundingBox)boundingBox;
                 bool shadowMapCreated = false;
                 int lightIndex = 0;
+                shadowMapTexture = null;
 
                 for (int i = 0; i < currentLights.Count; ++i)
                 {
@@ -281,7 +282,7 @@ public override void ApplyDrawParameters(RenderDrawContext context, ParameterCol
                     }
                 }
 
-                parameters.Set(shadowMapTextureKey, shadowMapTexture);
+                parameters.Set(shadowMapTextureKey, shadowMapTexture ?? context.GraphicsDevice.GetSharedDepthTexture());
                 parameters.Set(shadowMapTextureSizeKey, shadowMapTextureSize);
                 parameters.Set(shadowMapTextureTexelSizeKey, shadowMapTextureTexelSize);
 

sources/engine/Stride.Rendering/Rendering/Shadows/LightPointShadowMapRendererParaboloid.cs

@@ -278,6 +278,7 @@ public override void ApplyDrawParameters(RenderDrawContext context, ParameterCol
                 var boundingBox2 = (BoundingBox)boundingBox;
                 bool shadowMapCreated = false;
                 int lightIndex = 0;
+                shadowMapTexture = null;
 
                 for (int i = 0; i < currentLights.Count; ++i)
                 {
@@ -307,7 +308,7 @@ public override void ApplyDrawParameters(RenderDrawContext context, ParameterCol
                     }
                 }
 
-                parameters.Set(shadowMapTextureKey, shadowMapTexture);
+                parameters.Set(shadowMapTextureKey, shadowMapTexture ?? context.GraphicsDevice.GetSharedDepthTexture());
                 parameters.Set(shadowMapTextureSizeKey, shadowMapTextureSize);
                 parameters.Set(shadowMapTextureTexelSizeKey, shadowMapTextureTexelSize);
 

sources/engine/Stride.Rendering/Rendering/Shadows/LightSpotShadowMapRenderer.cs

@@ -215,6 +215,7 @@ public override void ApplyDrawParameters(RenderDrawContext context, ParameterCol
                 var boundingBox2 = (BoundingBox)boundingBox;
                 bool shadowMapCreated = false;
                 int lightIndex = 0;
+                shadowMapTexture = null;
 
                 for (int i = 0; i < currentLights.Count; ++i)
                 {
@@ -246,7 +247,7 @@ public override void ApplyDrawParameters(RenderDrawContext context, ParameterCol
                     }
                 }
 
-                parameters.Set(shadowMapTextureKey, shadowMapTexture);
+                parameters.Set(shadowMapTextureKey, shadowMapTexture ?? context.GraphicsDevice.GetSharedDepthTexture());
                 parameters.Set(shadowMapTextureSizeKey, shadowMapTextureSize);
                 parameters.Set(shadowMapTextureTexelSizeKey, shadowMapTextureTexelSize);
                 parameters.Set(worldToShadowCascadeUVsKey, worldToShadowCascadeUV);

sources/engine/Stride.Rendering/Rendering/Shadows/ShadowMapRenderer.cs

@@ -153,6 +153,8 @@ public void PrepareAtlasAsShaderResourceViews(CommandList commandList)
             {
                 atlas.PrepareAsShaderResourceView(commandList);
             }
+
+            // Fallback atlas uses ShaderResource-only texture, no transition needed
         }
 
         public void Flush(RenderDrawContext context)